Radio-guiding system



Dec. 18, 1951 c, ARIBERT 2,578,961

RADIO GUIDING SYSTEM Filed Jan. 12, 1949 osm PHASE REVERSER SCI LLATOROSCILLATOR INVENTOR' PHASE RE CHARLES ARIBERT I, T

CILLATOR BY ATTORNEY Patented Dec. 18, 1951 RADIO-GUIDING SYSTEM CharlesAribert, Paris, France, assignor to Societe francaise Sadir-Carpentier,Paris, France, a corporation of France Application January 12, 1949,Serial No. 70,481 In France January 15, 1948 3 Claims. 1 r My inventionrelates to a radio-aligning system providing four alignment axes.

It is known that radio fields varying in percentage modulation have withreference to radio fields varying in field strength, general advantagesthat are derived from the fact that the carrier waves have an amplitudethat is substantially independent of azimuth, whereby certainobjectionable efiects that are produced through the operation of theanti-fading system of the receiver system, are removed.

The arrangement according to my invention is characterized by the use offour aerials, for instance four vertical dipoles or doublet antennaslocated at the apices of a square. The antennas located at the ends ofeach diagonal line of said square are fed by current of the samefrequency, phase and amplitude and are similarly modulated. Furthermoreonly the side bands are transmitted. Each of these pairs of aerials isfed in phase opposition with reference to the other pair. Lastly acentral aerial transmits a partly modulated wave having the same highfrequency as the preceding aerials. This partly modulated wave issubstantially in phase with that transmitted by one of the diagonal pairof aerials, the phase of the partial modulation being reversed as in thecase of conventional radioaligning means at a predetermined rhythm, forinstance dot-dash rhythm or the complementary rhythm, generally known asthe an rhythm.

In accompanying drawings illustrating my invention by way of example inan entirely diagrammatic manner:

Fig. 1 shows the location of the aerials,

Fig. 2 illustrates the means for feeding the aerials.

Fig. 3 illustrates a modification in the arrangement of the aerials.

As shown in Fig. 1 the aerials l, 2, 3 and 4 are located at the apicesof a polygon. As disclosed hereinabove, the aerials l and 3 are fed withcurrents of identical phases and the value of which is I1=I sin wt sinpt The high frequency wave transmitted has a frequency w and themodulation has a frequency p. It is apparent that only the side bandsare transmitted. Similarly the aerials 2 and 4 are fed with identicalcurrents having the value I2=I sin wt sin pt. It is apparent that thecurrents I1-I2 are identical and diifer only through their sign.

Lastly the central aerial 5 is fed with a current 2 [3:] sin wt (liK sinpt) the signs and being substituted for one another at the desiredrhythm, say a dot and dash rhythm.

It is apparent that the current in the central aerial has the samefrequency and phase as concerns its high frequency component and also,except for its sign, as concerns its modulating component as the currentfed to the aerials at the four apices of the square.

Calculation shows readily that the component field of the aerials|'23--4- in a direction forming an angle 0 with the diagonal line l-3 isapproximately equal except for a multiplying factor depending ondistance, conditions of propagation, etc. to

Hs=sin wt sin pt cos 20 H=sin wt [1+sin ptUc; cos 20 k3)] (1) This leadsto a value of the percentage of modulation that is equal to =7cz cos20:!ca 2) It is thus apparent that the percentage of modulation of thefield received along the direction 0 does not vary or more accurately itmerely changes in sign without changing in absolute.

value when cos 20:0 which means It is thus apparent that the four halfaxes assume directions that are parallel with the sides of the aerialsquare l -23-4.

It is well known that the reception of such a field may be performedthrough a conventional receiver, say a receiver of the type used forbroadcasting if the modulation is at audio frequency or else any otherreceiver that is well known per se, such receivers obviously not formingpart of the present invention that covers only the production of theradio aligning means.

According to a modification, the reversal in phase, instead of affectingthe modulated portion of the waves transmitted by the central aerial isperformed on the feed of the two diagonal pairs of aerials. Itis-immediately apparent that in this modification the coefficient 7a; ofthe relationship (1) retains the same sign while the coefiicient Icz ofthe same equation changes sign at each reversal: the Equation 2 ismodified by way of consequence while the results obtained remain thesame.

Fig. 2 illustrates a manner of feeding aerials assumed to be in thepresent case dipole antennas, to wit the dipoles |2-3-4 arranged at theapices of the square and a central dipole antenna 5. directly inparallel through the feeders IS and I9 starting from a central feeder 6.On the other hand the dipole antennas 2 and 6 are fed similarly by thefeeders 26-2! fed in their turn by the same primary feeder 5 but withacrossin of the wires forming the feeders "2t and 2E which provides thedesired phase opposition; the different feeders are adjusted so as toproduce currents of equal amplitude in the four dipole antennas. As tothe central aerial 5, it is fed through a separate feeder l.

An oscillator 8, the frequency of which is w, feeds high frequencycurrent to both transmitters 9 and Ii! that are fed on the other hand bythe oscillator I I with the modulating voltage having afrequency p.

As'disclosed hereinabove'the transmitter 9 produces a single sidebandwith suppression of the carrier wave whereas the transmitter l producesa wave that is partly modulated. The transmitter [0 includes furthermoremeans 22 for reversing the phase of the modulation at the desiredrhythm.

In the modification disclosed hereinabove, said phase reversing meansare incorporated to the transmitter 9. I I

Fig. 3 illustrates a further embodiment of the aerials; the transmitters9 and i0 and oscillators 8 and H perform the same functions in thisembodiment as hereinabove and provide the same currents. The aerial isfed in the same manner through the feeder 1 starting from thetransmitter[0; only the manner of feeding the aerials I2--3-'-4 is changed. Thefeeder 6 is subdivided and forms two feeders I2I3- that are fed inparallel. Each of these secondary feeders l2--l3 forms again twobranches as shown, comprising the terminal feeders I4 and I5 on one handand I6 and I! on the other. The leads of the feeders l1 and are crossedwith reference to those of the feeders l4 and 16.. Furthermore, theleads of feeder I3 are crossed with reference to those of feeder l2.Obviously this arrange ment provides the same result, to wit, a feed inparallel of the dipole antennas l--3 and of the dipole antennas 2-4, thesystem of antennas I-3 being fed in phase opposition with reference tothe system of antennas 24.

Obviously many details may be modified in the arrangement disclosedwithout widening unduly thereby the scope of the invention as defined inaccompanying claims.

WhatI claim is: r l

1. Radio transmitting apparatus comprising four aerials positioned atthe apices of a four sided polygon, radio apparatus for feeding the pairof aerials positioned at the ends of one di- The dipole antennas !-3 arefed agonal of said polygon with high frequency oscillations ofpredetermined amplitude, the wave length of said oscillations being onthe order of the length of the longer diagonal of said polygon,apparatus for feeding high frequency oscillations of the same amplitudeand same high frequency as said first mentioned oscillations to theother pair of aerials located at the ends of the other diagonal of saidpolygon, said oscillations fed to said last mentioned pair of aerialsbeing of opposite phase from that of said oscillations fed to said firstmentioned pair of aerials, an additional aerial located substantially atthe center of said polygon, modulating apparatus for modulating theoscillations supplied to said four aerials at the same frequency, phaseand amplitude, apparatus for feeding high frequency oscillations of thesame frequency and phase of said first mentioned oscillations to saidadditional aerial, modulating apparatus for modulating the oscillationsfed to said additional aerial, apparatus for periodically reversing therelative phase of said last mentioned modulating apparatus withreference to the phase of the modulations applied to the oscillationsfed to said first mentioned pair of aerials to provide alternately phasecoincidence and phase concordance between the phases of these last twomodulations.

2. Radio transmitting apparatus comprising four aerials positioned atthe apices of a four sided polygon, radio apparatus for feeding the pairof aerials positioned at the ends of one diagonal of said polygon withhigh frequency oscillations of predetermined amplitude, the Wave lengthof said oscillations being on the order of the length of the longerdiagonal of said polygon, apparatus for feeding high frequencyoscillations of the same amplitude and same high frequency as said firstmentioned oscillations to the other pair of aerials located at the endsof the other diagonal of said polygon, said oscillations fed to saidlast mentioned pair of aerials being of opposite phase from that of saidoscillations fed to said first mentioned pair of aerials, an additionalaerial located substantiallyat the center of said polygon, modulatingapparatus for modulating the oscillations supplied to said four aerialsat the same frequency, phase and amplitude, apparatus for feeding highfrequency oscillations of the same frequency and phase of said firstmentioned oscillations to said additional aerial, modulating apparatusfor partially modulating the oscillations fed to said additional aerial,and apparatus for reversing the phase of the currents fed to saidadditional antenna in accordance with a predetermined pattern.

3. Radio transmitting apparatus comprising four aerials positioned atthe apices of a four sided polygon, radio apparatus for feeding the pairof aerials positioned at the ends of one diagonal of said polygon withhigh frequency oscillations of predetermined amplitude, the wave lengthof said oscillations being of the order of the length of the longerdiagonal of said polygon, apparatus for feeding high frequencyoscillations of the same amplitude and same high frequency as said firstmentioned oscillations to the other pair of aerials located at the endsof the other diagonal of said polygon, said oscillations fed to saidlast mentioned pair of aerials being of opposite phase from that of saidoscillations fed to said first mentioned pair of aerials, an additionalaerial located substantially at the center of said polygon, modulatingapparatus for modulating the 5 6 oscillations supplied to said fouraerials at the REFERENCES CITED same frequency Phase and amplitudeapparatus The following references are of record in the for feeding highfrequency oscillations of the m of thi at same frequency and phase ofsaid first mentioned e s p ent oscillations to said additional aerial,modulating 5 UNITED STATES PATENTS apparatus for modulating theoscillations fed to Number Name Date said additional aerial, andapparatus for period- 2,248,752 Goldman et a1. July 8, 1941 icallyreversing the phase of the currents fed to 2,293,694 Alford Aug. 25,1942 said first mentioned antennas in accordance with 2,414,431 Alfordet al. Jan. 21, 1947 a predetermined pattern. 10 FOREIGN PATENTS CHARLESARIBERT. Number Country Date 108,080 Australia July 21. 1939

